Catalytic oxidation of carbon monoxide over supported palladium nanoparticles

Abstract

Catalytic oxidation of CO with ozone had been studied over Al 2 O 3 and SiO 2 supported Pd nanoparticles which was synthesized by two different methods. The polyol method mainly resulted in highly dispersed Pd particles on the support, while the impregnation method resulted in agglomeration Pd particles on the support. Supported Pd nanoparticles synthesized from PdCl 2 in the presence of poly (N-vinylpyrrolidone) (PVP) by chemical reduction. The catalysts were characterized by X-ray diffraction, N 2 BET surface area, pore size distributions, CO chemisorption, TEM and H 2 -temperature programmed reduction. The physico-chemical properties were well correlated with activity data. Characterizations of XRD and TEM show that the surface Pd nanoparticles are highly dispersed over Al 2 O 3 and SiO 2 . The catalytic activity was dependent upon ozone/CO ratio, contact times, and the reaction temperature. The extent of carbon monoxide oxidation was proportional to the catalytically ozone decomposition. The PVP synthesized Pd/A 2 O 3 catalyst had been found to be highly active for complete CO removal at room temperature. The higher activity of the nanocatalyst was attributed to small particle size and higher dispersion of Pd over support.

Influence of the carbon support on the Pt–Sn anodic catalyst for the electrochemical reforming of ethanol

“…The BET surface area values collected in Table 1 are consistent with those found in the literature for the different materials: Carbon Vulcan XC-72 [51,52], β-SiC [50], GF [53] and CNF LS [52]. Moreover, it can also be observed that the specific surface areas of the different catalysts were smaller than those of the initial support materials due to partial blocking of the support pores by Pt-Sn particles after metal precursor impregnation [54]. Pt-Sn catalysts supported on Carbon Vulcan XC-72 (for comparative purposes), CNF LS, CNF f-LS and TRGrO presented a combination of type I and IV isotherms (not shown here)…”

Optimization of the catalytic support and membrane for the electrochemical reforming of ethanol in alkaline media

“…BET surface area values are similar to those found in the literature for the materials C Vulcan, GF and CNF LS . On the other hand, after metal deposition, the specific surface area was smaller than that of the parent support materials, which could be attributed to partial blocking of the support pores by Pd nanoparticles . This effect is the opposite for the pore size and pore volume, which increase after adding Pd to the parent C Vulcan and CNF LS supports.…”

Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

“…The light-off temperature follows the order of Pd/CeO 2 < Pd/TiO 2 < Pd/Al 2 O 3 < Pd/ZrO 2 ≤ Pd/ SiO 2 . The Pd/TiO 2 catalyst with lowest Pd dispersion has higher catalytic activity than Pd/Al 2 O 3 at lower temperatures which indicated that the Pd dispersion is not an important factor on supported Pd catalysts (Soni et al 2016;Sen et al 2016). The reduction of Pd ion to the metallic state is the most important factor controlling the CO oxidation.…”